Triangle abc with vertices a(4, −6), b(2, −8), and c(−10, 4) is dilated by a scale factor of 2 to obtain triangle a′b′c′. which statement best describes triangle a′b′c′?

it is similar to triangle abc and has coordinates a′(2, −3), b′(1, −4), and c′(−5, 2).
it is similar to triangle abc and has coordinates a′(8, −12), b′(4, −16), and c′(−20, 8).
it is congruent to triangle abc and has coordinates a′(2, −3), b′(1, −4), and c′(−5, 2).
it is congruent to triangle abc and has coordinates a′(8, −12), b′(4, −16), and c′(−20, 8).